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In this paper, a filter design guideline to reduce the ripple current in LLC resonant converters for the battery charger is proposed. The effect of filter inductor on the resonant network is mathematically analyzed, and a filter inductor is designed considering capacitance of the battery. The voltage gain of LLC resonant converter with filter inductor is analyzed through fundamental harmonic approximation...
In this paper, a mixed algorithm is proposed to improve SOC estimation accuracy for large-capacity Li-ion battery by using advantages of coulomb counting method, DCIR reset method, and enhanced OCV reset method. Because each method has drawbacks of accumulated SOC error during the operation in EVs, the optimal mixed algorithm is presented. Also, the weighted current value IDC based on the mathematical...
In order to use interleaved boost converters in the discontinuous conduction mode (DCM), the variation in the phase current and the input current ripple is analyzed theoretically. Based on the detailed analysis, a numerical formula for the input current ripple is deduced by including three criteria. Using the numerical formula, the optimized inductance that reduces the input current ripple and losses...
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